Snap works on one machine but not on another

name: clementine-snap # check to see if it's available
version: '1.3.1.22' # check the version number of clementine's packages
summary: Clementine is a modern music player. # 79 char long summary
description: |
  Clementine is a modern music player and library organizer for Windows, Linux and Mac OS X.
grade: devel # must be 'stable' to release into candidate/stable channels
confinement: devmode # use 'strict' once you have the right plugs

apps:
  clementine:
    command: desktop-launch $SNAP/bin/clementine 
    desktop: share/applications/clementine.desktop
    plugs:
      - network
      - home
      - pulseaudio
      - unity7
      - x11
      - gsettings
      - optical-drive
      - removable-media
      - screen-inhibit-control
      - alsa
  
parts:
  my-part:
    # See 'snapcraft plugins'
    build-packages:

       [liblastfm-dev,libtag1-dev,gettext,libboost-dev,libboost-serialization-dev,libqt4-dev,qt4-dev-tools,libqt4-opengl-dev,cmake,libgstreamer1.0-dev,libgstreamer-plugins-base1.0-dev,libglew1.5-dev,libqjson-dev,libgpod-dev,libplist-dev,libusbmuxd-dev,libmtp-dev,libcdio-dev,protobuf-compiler,libprotobuf-dev,libcrypto++-dev,libfftw3-dev,libsparsehash-dev,libsqlite3-dev,libpulse-dev,libqtwebkit-dev,libechonest-dev,libchromaprint-dev,libqca2-dev]
  
    stage-packages: 
      - libc6
      - libcdio13
      - libchromaprint0
      - libcrypto++9v5
      - libechonest2.3
      - libfftw3-double3
      - libgcc1 
      - libgl1-mesa-glx
      - libgl1
      - libglew1.13
      - libglib2.0-0
      - libgpod4
      - libgstreamer-plugins-base1.0-0
      - libgstreamer1.0-0
      - liblastfm1
      - libmtp9
      - libprotobuf9v5
      - libpulse0
      - libqjson0
      - libqt4-dbus
      - libqt4-network
      - libqt4-opengl
      - libqt4-sql
      - libqtcore4
      - libqtgui4
      - libsqlite3-0
      - libstdc++6
      - libtag1v5
      - libx11-6
      - zlib1g
      - gstreamer1.0-plugins-base
      - gstreamer1.0-plugins-good
      - gstreamer1.0-plugins-ugly
      - gstreamer1.0-plugins-bad 
      - gstreamer1.0-pulseaudio
      - libprojectm2v5
      - projectm-data

    source-type: git
    source: https://github.com/clementine-player/Clementine
    after: [desktop-qt4] 
    plugin: cmake

As you can see, I’ve added the suggested package to staging (thanks @lucyllewy). I’m building now and will post results.